Yes, there are still races in Long Beach and São Paulo this month before official practice opens at Indianapolis Motor Speedway, but Wednesday's open test at the Brickyard brings the participation list to the forefront.

As former driver and current team owner Robbie Buhl said, Indianapolis always finds a way to have 33 cars. But series officials agree that with the new engines and chassis, there are not going to be as many extra car-and-driver combos as in years past.

A look at the plans of the teams:

Chevrolet teams

Andretti Autosport: Cars for Marco Andretti, Ryan Hunter-Reay and James Hinchcliffe as IndyCar regulars, plus the announced Indy-only deal for Firestone Indy Lights driver Sebastian Saavedra, who has competed in two 500s. Michael Andretti also is close to finalizing plans for a fifth car, with Ana Beatriz having tested with the team.

Ed Carpenter Racing: The driver is now the boss, so the focus will be on his program. But a second car could be in the works if there's enough money to do it right.

KV Racing Technology: Team owner Jimmy Vasser said there's no need for extra cars with Rubens Barrichello being an oval neophyte. Tony Kanaan and E. J. Viso drive the other two cars.

Panther Racing: There's speculation that the team will add a second car to go alongside J. R. Hildebrand's, but team owner John Barnes said no.

Team Penske: Cars for Helio Castroneves, Will Power and Ryan Briscoe are all we'll see from Roger Penske and Tim Cindric.

Honda teams

A. J. Foyt Racing: One car for Mike Conway. A. J. Foyt and his son, Larry, who now runs the team day to day, said they want a second at Indy, but plans haven't been finalized.

Dale Coyne Racing: Cars for Justin Wilson and James Jakes. Dale Coyne isn't a team owner who fields extra cars at Indy.

Rahal Letterman Lanigan Racing: Takuma Sato's full-season deal will have a partner for the rest of year beginning in May. Last year's GP2 runner-up, Luca Fillipi, will drive that car, and Bobby Rahal might yet add another for the 500.

Schmidt Hamilton Racing: Simon Pagenaud is set, and team owners have another deal ready to put the finishing touches on. Team co-owner Davey Hamilton wants to be the third driver in the program but only if the budget and the engines are there.

Sarah Fisher Hartman Racing: Josef Newgarden could be rookie of the year at Indy, and he's close to having a teammate finalized.

Lotus teams

Bryan Herta Autosport: Alex Tagliani will drive the car of last year's Indy-winning team. It's doubtful that there will be a second car because of the engine situation.

Dragon Racing: Reorganized team has cars for Sébastien Bourdais and Katherine Legge. That's enough even if Lotus had extra engines to give.

Dreyer & Reinbold Racing: Team wants a partner for Oriol Servia, but it will depend on Lotus's ability to accommodate.

HVM Racing: Team owner Keith Wiggins set with the one car for Simona De Silvestro.

Teams without engine deals

Conquest Racing: Eric Bachelart's team hasn't participated in IndyCar so far this season, and the likely path is a pairing with Andretti Autosport for one of the cars mentioned above.

MSR Indy: Michael Shank's new team has a car but not the money or the engine deal to run it.